Automatic fire-alarm



Patented July 18,1893.

(No Model.)

J HAVARD AUTOMATIC PIRE ALARM.

UNITED STATES PATENT OEEICE.

JOSEPH HAVARD, OF NEV BEDFORD, MASSACHUSETTS.

AUTOMATIC Fl RE-ALARVI SPECIFICATION forming part of Letters Patent No.501,653, dated July 18, 1893.

Application filed May 10| 1893. Serial No. L73,662. (No model.)

To @ZZ whom t may concern.-

Be it known that I, JOSEPH Havant, a subject of the Queen of GreatBritain, residing at New Bedford, in the county of Bristol and State ofMassachusetts, have invented a new and useful Automatic Fire-Alarm, ofwhich the following is a specification.

The Object of my invention is to provide a device, by means of which, analarm of tire is given automatically', when the atmospherein any part ofa building, has reached a given point of heat.

The accompanying drawings, illustrate my invention, in which- Figure l.represents a front View, as it appears when attached to a wall, showingin dotted lines, the circuit, broken. Fig. 2. represents a front View,with the cover of the device removed, to show the internal construction,and showing the circuit, closed. Fig. 3. is a view of the saine incross-section through the line 0c, cc.

Similar letters refer to similar parts in the several views.

a, represents a box, composed of suitable, non-conducting material,having the slots c, e, in its sides, leading to the interior Z), andhaving a cover m, and the projection Z.

c, c, are strips of metal, secured to the sides of the box a, by screwsCZ, CZ, and extending through the slots c, e, to the interior Z), wherethey normally come in contact with each other by the spring of themetal.

g, is a wire, attached to the interior end of one of the strips c,leading to the outside of the box a, through a hole ZL, where its end isadapted to be secured to the part Z, by a bit of wax; or metal whichsoftens at a low heat; or provided with a loop, to which a thread isattached, as hereinafter described.

f, f, are wires, secured in contact with the strips c, c, leading to abattery and alarm bell, neither of which is shown.

The operation is as followsz-The device7 having the strips c, C,disconnected (as shown in Fig. l.) by the wire g, which is secured bywax, fusible metal, or a thread; is secured against the ceiling or thewall of the several rooms in a building, and connected by wires f, f, toa battery, and an alarm bell which are situated preferably, in some oneof the rooms which is usually or continually occupied. Now, should afire occur in any one of said rooms, the heat from the same would softenthe wax, or fuse the metal, or burn the thread, and release the wire g,and allow the strips c, to come together and complete the circuit, andgive the alarm.

In an electric alarm, an automatic circuit closer, consisting of a boxcomposed of nonconducting material having slots in its sides, andprovided with a projection Z.; strips of spring metal secured to thesides of said box, and extending through said slots to the interior ofthe box, where they normally come in contact by the spring ot' themetal; a wire, connected with one of said springs, extending to theoutside of said box and over the projection Z, and provided with a loopwhereby the said strips may be held out of contact, by fusible metal,wax, or a cord; for the purpose, as shown and described.

J OSEPII HAVARD.

Witnesses:

J OsEPH C. PATNAUDE, HENRY W. MAsoN.

